What is the purpose of the com

It reads commands from the user or from a file of commands and executes them,usually by turning them into one or more system calls.It is usually not part of the kernel since the command interpreter is subject to changes.An user should be able to develop a new command interpreter using the system-call interface provided by the operating system.The command interpreter allows an user to create and manage processes and also determine ways by which they communicate (such as through pipes and files).As all of this functionality could be accessed by an user-level program using the system calls,it should be possible for the user to develop a new command-line interpreter.